58 lines
1.8 KiB
Python
58 lines
1.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 Cloudbase Solutions Srl
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import json
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import logging
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import os
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import posixpath
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LOG = logging.getLogger(__name__)
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class BaseMetadataService(object):
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def load(self):
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self._cache = {}
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def _get_data(self, path):
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pass
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def _get_cache_data(self, path):
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if path in self._cache:
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LOG.debug('Using cached copy of metadata: \'%s\'' % path)
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return self._cache[path]
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else:
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data = self._get_data(path)
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self._cache[path] = data
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return data
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def get_content(self, data_type, name):
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path = posixpath.normpath(
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posixpath.join(data_type, 'content', name))
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return self._get_cache_data(path)
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def get_user_data(self, data_type, version='latest'):
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path = posixpath.normpath(
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posixpath.join(data_type, version, 'user_data'))
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return self._get_cache_data(path)
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def get_meta_data(self, data_type, version='latest'):
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path = posixpath.normpath(
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posixpath.join(data_type, version, 'meta_data.json'))
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return json.loads(self._get_cache_data(path))
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def cleanup(self):
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pass
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